Figure 3-16.Muscle anatomy of mastication.MuscleOrbicularis orisTable 3-3.Muscles of Facial ExpressionOriginInsertionEncircles the mouth (noCorners of the mouthattachement to bone)DescriptionLocated between the skin andmucous membranes of thelips. Makes lips close andpucker.BuccinatorAlveolar process ofmaxilla and mandibleOrbicularis oris at the cornerLocated in the walls of theof the mouthcheeks, holds food in contactwith teeth when chewing, andassists in blowing air out ofthe mouth.MentalisMandibleSkin of chinRaises and wrinkles the skinof the chin and decreases andprotrudes the lower lip.Zygomaticus MajorZygomatic boneOrbicularis oris (angle of theRaises the corner of themouth)mouth when smiling.3-9